March-April 2011: Pictured at left, Thomas Hertzog helps in the drillling, using the lever to lift and drop the drill pipe while the driller's palm acts as a one way valve for circulation. | ![]() |
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Transect of Tube Wellsposted Jul 13, 2011, 10:37 AM by Ellie Ferguson [ updated Jul 25, 2011, 7:09 AM ]
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